Connected: An Internet Encyclopedia
RFC 821 - 4.5.1. MINIMUM IMPLEMENTATION

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### 4.5.1. MINIMUM IMPLEMENTATION

In order to make SMTP workable, the following minimum implementation is required for all receivers:

                COMMANDS -- HELO
                            MAIL
                            RCPT
                            DATA
                            RSET
                            NOOP
                            QUIT

Next: 4.5.2. TRANSPARENCY

Connected: An Internet Encyclopedia
RFC 821 - 4.5.1. MINIMUM IMPLEMENTATION